06-08-2013, 04:51 PM
Effect of different levels of Meloidogyne incognita and nematicides on plant growth of chickpea and population dynamics of nematode
ABSTRACT
Experiment was conducted to find out the effect of different inoculum levels of Meloidogyne incognita nematode and effect of nematicides on the plant growth and nematode multiplication on chickpea. Significant reduction occurred in plant growth parameters viz., shoot length, root length, shoot and root weight and dry shoot weight inoculated with 500, 1000, 2000 and 3000 juveniles/pot. The highest gall index was recorded at inoculum levels of 2000 and 3000 respectively. Total nematode population/plant significantly increased progressively with an increase in nematode population from 100-3000/plant. Reduction in multiplication of the nematode was observed with increase inoculum level. Management strategies have been standardized for the efficient use of certain nematicides for the management of M. incognita on chickpea (carbofuran and chlorpyriphos @1 and 2 kg a.i/ha). Application of nematicides significantly increased plant growth and decreased the host infestation by M. incognita over control. Maximum plant height was recorded in carbofuran @ 2.0 kg a.i/ha treated soil followed by carbofuran 1.0, chlorpyriphos 2.0, and chlorpyriphos 1.0 kg a.i/ha respectively. However, no more differences between carbofuran 1.0 kg a.i/ha and chlorpyriphos 2.0 kg a.i/ha at plant growth and nematode multiplication levels. The minimum population was recorded in carbofuran at 2.0 kg a.i/ha and maximum population in chlorpyriphos at 1.0 kg a.i /ha treated soil. The both nematicides are effective as a form of chemical control measures.